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Lesson 26: I2C LCD 1602

In this lesson, you will learn the basics of displaying text on an LCD screen using a Raspberry Pi. We’ll start by showing you how to connect a standard LCD to the Raspberry Pi using the I2C interface. You’ll learn how to set up the LCD with simple parameters like the Raspberry Pi model and I2C address. Then, we’ll walk you through writing a basic Python script to display messages like “Hello World!” on the screen. This straightforward project is aimed at beginners, offering a foundational introduction to interfacing hardware with the Raspberry Pi and basic Python programming.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Universal Maker Sensor Kit	94	Universal Maker Sensor Kit

You can also buy them separately from the links below.

Component Introduction	Purchase Link
Raspberry Pi 5	BUY
I2C LCD 1602	BUY

Wiring

Code

import time
from LCD import LCD

# Initialize the LCD with specific parameters: Raspberry Pi revision, I2C address, and backlight status
lcd = LCD(2, 0x27, True)  # Using Raspberry Pi revision 2, I2C address 0x27, backlight enabled

# Display messages on the LCD
lcd.message("Hello World!", 1)        # Display 'Hello World!' on line 1
lcd.message("    - Sunfounder", 2)    # Display '    - Sunfounder' on line 2

# Keep the messages displayed for 5 seconds
time.sleep(5)

# Clear the LCD display
lcd.clear()

Code Analysis

Import Libraries

Import the time module for creating delays and the LCD module for controlling the LCD.

For more detail about the LCD library, please refer to sterlingbeason/LCD-1602-I2C.
```
import time
from LCD import LCD
```
Initialize the LCD

Create an LCD object with specific parameters: the Raspberry Pi revision, the I2C address of the LCD, and the backlight status. In this case, Raspberry Pi revision 2(and higher version), I2C address 0x27, and backlight enabled.
```
lcd = LCD(2, 0x27, True)
```
Display Messages on the LCD

Use the message method of the LCD object to display text on the LCD. The first argument is the text, and the second argument is the line number.
```
lcd.message("Hello World!", 1)
lcd.message("    - Sunfounder", 2)
```
Keep the Messages Displayed

Pause the program for 5 seconds, keeping the messages on the LCD during this time.
```
time.sleep(5)
```
Clear the LCD Display

After the delay, clear the display using the clear method of the LCD object.
```
lcd.clear()
```